Evaluation of deep venous thrombosis in lower extremities using 64-slice spiral CT venography and curved planer reconstruction

Abstract

Objective To explore the value of multi-slice spiral CT venography (MSCTV) and curved planer reconstruction (CPR) in diagnosis of deep venous thrombosis (DVT) in lower extremities. Methods MSCT was pedormed in 19 patients with DVT in lower extremities, with scanning ranging from the anterior superior lilac spine to the ankle. The constrnst medium was injected via the cubital vein. Scanning started with Smart Prep scanning model when the inferior vena density reached 100 Hu. Common iliac veins, external iliac veins, femoral veins, pepliteal veins and posterior tibial veins were reconstructed with CPR post-processing software. We obtained diagnosis from CPR images combined with volume rendering (VR), multi-plannar reconstruction (MPR) and raw data, and MSCTV results of nine patients were compared with color Doppler ultrasonography. Results MSCTV clearly demonstrated all 259 segments of deep veins of lower extremity in 19 patients, of which 73 segments had DVT. All target vessels were clearly displayed on CPR images except for posterior tibial veins. Vein thrombosis presented double track sign , irregular narrowing or obstruction on CPR images. The transverse diameter of the lumens was larger than that of the normal ones (P<0.05 ). Conclusion MSCTN and CPR have many advantages and can be used as a routine method in the diagnose of DVT. Key words: Venous thrombosis; Tomngraphy; spiral computed; Angiocardingrahy; Curved planer reconstruction